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      叶尘
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        星期一, 九月 13日 2021, 8:46 晚上
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            <h1 style="display: none">Http网络协议包</h1>
            
            <div class="markdown-body">
              <h3 id="一、网络协议包："><a href="#一、网络协议包：" class="headerlink" title="一、网络协议包："></a>一、网络协议包：</h3><ol>
<li>在网络中传递信息都是以 ==二进制== 形式存在的。</li>
<li>接收方【浏览器/服务器】在接收信息后，要做第一件事就是将【二进制数据】进行编译【文字，图片，视频，命令】</li>
<li>传递信息数据量往往比较巨大，导致接收方很难在一组连续二进制得到对应数据</li>
</ol>
<figure class="highlight awk"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><code class="hljs awk">比如 浏览器发送一个请求： http:<span class="hljs-regexp">//</span><span class="hljs-number">192.168</span>.<span class="hljs-number">100.2</span>:<span class="hljs-number">8080</span>/index.html<br>这个请求信息以二进制形式发送 <span class="hljs-number">01010101010110101010101101010</span><br>Http服务器很难从二进制数据得到相关信息<br></code></pre></td></tr></table></figure>

<ol start="4">
<li>==网络协议包是一组有规律二进制数据，在这组数据存在提供了一些固定空间。==每一个空间专门存放特定信息，这样接收方在接收网络协议包之后 就可以到固定空间得到对应信息，网络协议包出现极大降低了接收方对接收二进制数据编译难度</li>
</ol>
<figure class="highlight armasm"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><code class="hljs armasm">如：<br>【<span class="hljs-number">0000</span>（<span class="hljs-built_in">ip</span>地址）<span class="hljs-number">0000</span>（端口号）<span class="hljs-number">0000</span>（资源文件名）<span class="hljs-number">0000</span>】<br></code></pre></td></tr></table></figure>



<h3 id="二、常见的网络协议："><a href="#二、常见的网络协议：" class="headerlink" title="二、常见的网络协议："></a>二、常见的网络协议：</h3><ol>
<li><strong>FTP 网络协议包</strong></li>
<li><strong>Http 网络协议包</strong></li>
</ol>
<h3 id="三、Http-网络协议包："><a href="#三、Http-网络协议包：" class="headerlink" title="三、Http 网络协议包："></a>三、Http 网络协议包：</h3><blockquote>
<p><strong>在基于B/S结构下互联网通信过程中，所有在网络中传递信息都是保存在Http网络协议包。</strong></p>
</blockquote>
<p>分类：</p>
<ul>
<li>Http 请求协议包</li>
<li>Http 相应协议包</li>
</ul>
<h3 id="四、Http-请求协议包"><a href="#四、Http-请求协议包" class="headerlink" title="四、Http 请求协议包"></a>四、Http 请求协议包</h3><blockquote>
<p><strong>在浏览器准备发送请求时，负责创建一个Http请求协议包，浏览器将请求信息以二进制形式保存在Http请求协议包中的各个空间，由浏览器负责将Http请求协议包推送到指定服务端计算机</strong></p>
</blockquote>
<p><strong>Http 请求协议包按照自上而下划分，分为4个空间：</strong></p>
<ul>
<li>请求行：<ul>
<li>url:请求地址（<a target="_blank" rel="noopener" href="http://192.168.100.2:8080/index.html%EF%BC%89">http://192.168.100.2:8080/index.html）</a></li>
<li> method:请求方式（POST/GET）</li>
</ul>
</li>
<li> 请求头：</li>
<li>请求参数信息【<strong>如果使用 GET 请求方式</strong>】</li>
<li>空白行：<ul>
<li>没有任何内容，起到隔离作用</li>
</ul>
</li>
<li> 请求体：</li>
<li>请求参数信息【<strong>如果使用 POST 请求方式</strong>】</li>
</ul>
<h3 id="五、Http-响应协议包"><a href="#五、Http-响应协议包" class="headerlink" title="五、Http 响应协议包"></a><strong>五、Http 响应协议包</strong></h3><blockquote>
<p><strong>Http服务器在定位到被访问的资源文件之后。负责创建一个Http响应协议包。</strong><br><strong>Http服务器将定位文件内容或则文件命令以二进制形式写入到Http响应协议包各个空间。</strong><br><strong>由Http服务器负责将Http响应协议包推送回发起请求的浏览器上。</strong></p>
</blockquote>
<p><strong>Http 相应协议包按照自上而下划分，分为4个空间：</strong></p>
<ul>
<li><p> 状态行：</p>
</li>
<li><p>Http 状态码</p>
</li>
<li><p>响应头：</p>
<ul>
<li>content-type: 指定浏览器采用对应编译器，对响应体二进制数据进行解析</li>
</ul>
</li>
<li><p>空白行：</p>
<ul>
<li>没有任何内容，起到隔离作用</li>
</ul>
</li>
<li><p>响应体：</p>
<ul>
<li>可能被访问<strong>静态资源文件内容</strong></li>
<li>可能被访问的<strong>静态资源文件命令</strong></li>
<li>可能被访问的<strong>动态资源文件运行结果</strong></li>
<li>==都是以二进制形式==        </li>
</ul>
</li>
</ul>

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